Crankshaft grinder



March i8, 1941. A. J. BRAZIL CRANKSHAFT GRINDER Filed Aug. 19, 1959 2 Sheets-Sheet l INVENTOR. ,4061/57- J WAZ/L. BY W/X ATTORNEY.

March 18, 1941. A. J. BRAZIL CRANKSHAFT GRINDER 2 Sheets-Sheet 2 Filed Aug.

atented Mar. i8, 194i 2,235,417 l oannnsnar'r campen August .l'. Brazil,A Wichita, Kans., assignor of ouetwentieth to Ernest L. Cooper, Harper, Kans., and one-tenth to Elmer L. Berner, Heston,

Kans.

Appnmemaugest i9, 1939, serial No. Y291,034

4 Claims.

This invention relates to a crankshaft grinding tool, more particularly to a tool ofthe nature shown in United States Patent No.l 2,061,764.

The usual crankshaft grinding tool of lthis.

nature is suspended from a hook or 'other overhanging structure which rides upon the top surface of the crankshaft bearing. With such a construction, the supporting member descends into the hollows in the shaft and as a result lowers the grinding member so that it is impossible to round an oval shaft or remove irregularities therefrom.

The principal object of this invention is to provide a crankshaft grinding tool which will not be affected by any irregularities in the surface of the bearing and which will not be affected by any differences in diameter therein but which will obtain its entire guiding support from the bearing surface adjacent the grinding wheel.

Other objects of the invention are to provide a construction which will be adjustable to difiering diameters of crankshaft bearings; which will not scratch the bearing due to particles of metal or abrasive; which will automatically pass par- 'v 30 Other objects and advantages reside iny the detail construction of the invention, which is designed for simplicity, economy, .and efciency. These will become more apparent from the following description.

In the following detailed description of the invention reference is had to the accompanying drawings which form a part hereof. Like numerals refer to like parts in all views of the drawings and throughout the description.

In the drawings: y g

Fig. 1 is an edge view of the improved crankshaft drawing.

Fig. 2 is a face View thereof.

Fig. 3 is a vertical longitudinal section therethrough, taken on the line 33, Fig. 2.

Fig. 4 is a fragmentary section through'the grinding head, taken on the line t-L Fig. 1.

Fig. 5 is a detail'cross section, taken on the line 5-5, Fig. 4. f

Figs. 6 and 7 are detail views of the rocker roller block employed in the device.

Fig. 8 is a detail view of the clamp plate employed for holding the Contact rollers in the rocker block.

l Fig. 9 is a detail view of the lower or spacing f roller.

Fig. 10 is a detail View of the upper or short form of contact roller.

The improved crankshaft grinding tool em- I ploys a frame member lo, the lower extremity of which is extended downwardly to vform a knurled handle II. The knurled extremity of the handle II is taper-threaded, as, shown at I2 and formed with a series of splits I3. The splits I3 can be clamped together by means of a cylindrical clamping sleeve I4 which is threaded onto the tapered vportion I2. An internally threaded passage extends throughout the entire length of the member It to receive the externally threaded shaft tube I5.

The upper extremity of the shaft tube I5 projects into an open notch I6 in the topV of the member I. The lower extremity of the shaft tube is formed with a knurled hand grip Il" which can be gripped in the palm of the hand to thread the tube I5 into or out of the member It., The tube I5 can be locked in the member It in any desired adjusted position by tightening the knurled sleeve I4 to close the split extremity i3 against the tube I5.

A grinding shaft I8 passes completely through the shaft tube I5 and is carried therein in a pair of upper ball bearings I9 and av similar pair of. lower ball bearings 2U. The upper ball bearings I9 are mounted in a cylindrical bearing cage 2| which is threaded onto the upper extremity of the adjusting tube I5. Thelower ball bearings 2d are carried in the hand grip I7. The bearingsare of the preloaded type, that is, a preliminary pressure is placed thereon by means of clamping nuts 22 which take up any end play therein. A dust cap is threaded onto and rotates with the shaft I8.

Agrinding wheel 24 is threaded onto the upper extremity of the shaft I8 against the dust cap 23. The lower extremity of the shaft; is drilled and threaded, as shown at l25, to receive the extremity of a flexible shaft (not shown). The flexible housing enclosing the flexible shaft, shown at 26, is received in a swivel sleeve 2l. The sleeve 2T is free to rotate within a swivel nut 28 which is threaded into the bottom of the hand grip Il.

t can be readily seen that the grinding wheel is free to rotate under the action of the flexible shaft and that it can be readily adjusted up and down in the member I0 by rotation of the adjusting tube I 5 and that it can be locked in any adjusted position by tightening the clamp sleeve I4 The upper extremities of the frame member I El, at each side of the grinding wheel I4, are concave and their concave surfaces are grooved or serrated, as shown at 29, to receive a pair of gauge blocks 30. The lower surfaces of the gauge blocks 30 are clamped in place by means of clamp screws 3l which pass through enlarged bolt sockets in the member lil so as to allow a tilting adjustment as well as an in and out adjustment to be made of the gauge blocks 33. The serrations. or teeth firmly lock the blocks in their adjusted positions so that they cannot be accidently moved by the Vibration of the tool.

A hinged clamp bolt 32 extends upwardly from a hinge pin 33 in each block. An arch bar 34 extends between the clamp bolts 32 and is constantly urged toward the gauge blocks 39 by means of compression springs 35 and clamp nuts 36. Both of the gauge blocks and the arch bar carry contact rollers for contacting the bearing on which the tool is being used. The rollers in the gauge blocks consist of an upper contact roller 31 and a lower spacing roller 33, shown in detail in Figs. 10 and 9, respectively. The upper roller 31 is formed with enlarged, oppositely threaded extremities 31. The lower roller is similarly formed with oppositely threaded enlarged portions 33' from which spacing extremities 38 project.

The rollers 31 and 33 are held in a rocker block 39 having a semi-cylindrical face which fits into a semi-cylindrical socket 40 in the gauge blocks 30. A spring clamp plate 45 holds the rollers in place in the rocker block. The rocker blocks are held in place by means of screws 4I arranged so that they may swing vertically in slotted openings 42 in the gauge blocks. Contact rollers 44 are also placed in the arch bar 34 and held in place therein by means of an arcuate clamp plate 42 and clamp screws 43.

The gauge blocks 3i! are arranged on the frame ID in oifset relation from the axis of the grinding shaft I8, as illustrated in Fig. 2, by the offset in the section line 3 3, so that the center line between the gauge blocks is spaced to one side of the center line of the grinding wheel.

In use, the arch bar 34 is placed over the top of a crankshaft bearing and the grinding wheel is drawn downward out of contact with the bearing. The nuts 36 are tightened to bring the rollers 31 and 38 into contact with the bearing while the screws 4I are loose. This allows the rocker blocks to turn in their sockets to bring the two rollers 31 and 33 into uniform contact with the bearing surface. After this contact has been made, the screws 4| are tightened to maintain the rocker blocks in their positions. The crankshaft is now rotated and the grinding wheel is started. The adjusting tube is threaded upwardly until the grinding Wheel contacts the bottom of the bearing and the clamp sleeve I4 is tightened to. maintain the grinding wheel adjustment. Any irregularities in diameter of the bearing will simply act on the springs 35 without effecting the grinding wheels adjustment since this is maintained by the contact ofthe four rollers 31 and 38. The grinding-r is continued on the rotating crankshaft until all high spots have been removed and perfect roundness has been attained.

The tool is furnished with a series of grinding wheels of different diameters corresponding to the Widths of the bearings upon which it is to be used.

A wheel equal to the full bearing width is always selected. The tool is also furnished with a series of spacing rollers 38 corresponding in length to the various grinding wheel diameters so that the wheels will always be accurately maintained at the center of the bearings.

It is desired to call attention to the fact that the contacting surfaces of all the rollers are grooved or threaded so that the Contact is only at a series of spaced points, one point on each thread. This prevents grinding inaccuracies due to high points in the bearing or due to the rollers passing over metal or abrasive particles. These small particles of abrasive dust pass into the thread hollows and the threads are so formed that they will screw these pieces outwardly at both sides, dropping them to the sides of the tool so that they will not scratch or score the bearing.

While a specific form of the improvement has been described and illustrated herein, it is desired to be understood that the same may be varied, Within the scope of the appended claims, without departing from the spirit of the invention.

Having thus described the invention, what is claimed and desired secured by Letter Patent is:v

1. A crankshaft grinding device comprising: a frame member; a shaft tube threaded through said frame member; a grinding shaft carried by said shaft tube; a grinding Wheel at one extremity of said shaft; gauge blocks secured to said frame member at each side of said grinding wheel in offset relation to the axis thereof, said gauge blocks being transversely adjustable relative to the axis of said shaft; hanger means for supporting said frame member from a crankshaft bearing; adjustable members connecting said hanger means with said gauge blocks so that when the latter are transversely adjusted on said frame member said hanger means will be similarly and automatically adjusted.

2. A crankshaft grinding device comprising: a frame member; a shaft tube threaded through said frame member; a grinding shaft carried by said shaft tube; a grinding Wheel at one extremity of said shaft; gauge blocks secured to said frame member at each side of said grinding wheel in offset. relation tothe axis thereof; hanger means for supporting said frame member from a crankshaft bearing; adjustable members connecting said hanger means with said gauge. blocks; rocking blocks carried by said gauge blocks; and rollers carried' by said rocking blocks for contacting the crankshaft bearing.

3. Means for spacing a grinding wheel from a crankshaft bearing in a crankshaft grinding tool'A comprising: a series of pairs of rollers positioned to contact said bearing;` and a rocking block carrying each pair of rollers in recesses therein, the surfaces of said rollers being circumferentially grooved so that they Willcontact said bearing at spaced-apart points, said groovesv being formed in spirals so as to carry foreign material from the recesses in said rocking block.

4. Means for spacing a grinding wheel from a crankshaft bearingy in a crankshaft grinding tool comprising; a. series'` of pairs of contact rollers riding against said bearing.; and arocking block carrying each pair of` rollers,- the` rollers of each pair being positioned on opposite si'des of the axis of said block, said blocks being free to move so as to equalize the pressure on the rollers therein.

AUGUST J. BRAZIL. 

